Gemstone



FIG. 1 is a top view of an exemplary gemstone;

FIG. 2 is a bottom view of the exemplary gemstone;

FIG. 3 illustrates front, back, left and right views of the exemplary gemstone;

FIG. 4 is a side view of the exemplary gemstone rotated by 45 degrees (an oblique view, viewed from line 4-4 in FIG. 1); and,

FIG. 5 is an upper perspective view of the exemplary gemstone. 

The ornamental design for a gemstone, as shown and described. 